Solid electrolytic condenser with enhanced volumetric efficiency

Abstract

A solid electrolytic condenser includes a condenser element, an anode wire including one end inserted into the condenser element, a cathode drawing layer formed on outer side of the condenser element, terminal reinforcements arranged respectively under opposite side portions of a bottom surface of the condenser element, a liquid epoxy resin filled in spaces between the terminal reinforcements and between the bottom surface of the condenser element and top surfaces of the terminal reinforcements, a molding part surrounding the condenser element while exposing the other end of the anode wire, an end portion of the cathode drawing layer, and bottom surfaces of the terminal reinforcements, and anode and cathode terminals formed by a plating layer provided on the bottom surfaces of the terminal reinforcements and on opposite side surfaces of the molding part. The liquid epoxy resin includes fillers of a smaller size than those in the molding part.

What is claimed is: 
     
       1. A solid electrolytic condenser, comprising:
 a condenser element including an inner side that has an anode polarity; 
 an anode wire including one end portion that is inserted into the condenser element; 
 a cathode drawing layer formed on an outer side of the condenser element; 
 terminal reinforcements arranged respectively under opposite side portions of a bottom surface of the condenser element; 
 a liquid epoxy resin (EMC) filled in (a) a space between the terminal reinforcements and (b) spaces between the bottom surface of the condenser element and top surfaces of the terminal reinforcements; 
 a molding part surrounding the condenser element while exposing a protruded end portion of the anode wire, an end portion of the cathode drawing layer, and bottom surfaces of the terminal reinforcements; and 
 anode and cathode terminals formed by a plating layer provided on the bottom surfaces of the terminal reinforcements and on opposite side surfaces of the molding part, wherein 
 the liquid epoxy resin includes fillers of a smaller size than those in the molding part. 
 
     
     
       2. The solid electrolytic condenser of  claim 1 , further comprising:
 a conductive buffering material that is interposed between the condenser element and the cathode drawing layer. 
 
     
     
       3. The solid electrolytic condenser of  claim 1 , wherein the terminal reinforcements include a metal material or a synthetic resin material. 
     
     
       4. The solid electrolytic condenser of  claim 3 , wherein the terminal reinforcements include steel or a metal selected from the group consisting of Cu and Ni. 
     
     
       5. The solid electrolytic condenser of  claim 3 , wherein a thickness of the terminal reinforcements is 20 μm to 50 μm. 
     
     
       6. The solid electrolytic condenser of  claim 1 , wherein the liquid epoxy resin contacts at least two surfaces other than the exposed bottom surface of each of the terminal reinforcements with one another, thereby improving bonding strength of the terminal reinforcement. 
     
     
       7. The solid electrolytic condenser of  claim 1 , further comprising:
 a conductive buffering material that is interposed between the condenser element and the cathode drawing layer, wherein the conductive buffering material is a lead frame including steel or a paste material. 
 
     
     
       8. The solid electrolytic condenser of  claim 1 , wherein the cathode drawing layer is formed in a dispensing type, a dipping type, or a printing type. 
     
     
       9. The solid electrolytic condenser of  claim 8 , wherein the cathode drawing layer is formed in a viscous paste type in which a conductive material is contained. 
     
     
       10. The solid electrolytic condenser of  claim 8 , wherein the cathode drawing layer is formed of a viscous conductive paste including one selected from the group consisting of Au, Pd, Ag, Ni, and Cu. 
     
     
       11. The solid electrolytic condenser of  claim 1 , wherein the anode terminal and the cathode terminal are formed by any one selected from the group consisting of electro plating, electroless plating, dipping, and paste coating. 
     
     
       12. The solid electrolytic condenser of  claim 11 , wherein, when the anode terminal and the cathode terminal are formed through electroless plating, the plating layer includes:
 an internal plating layer formed through electroless Ni/P plating, and 
 an external plating layer formed on the internal plating layer through Cu plating, or Sn plating. 
 
     
     
       13. The solid electrolytic condenser of  claim 1 , wherein the anode terminal and the cathode terminal formed by the plating layer extend from the opposite side surfaces of the molding part to the bottom surfaces of the terminal reinforcements adjacent thereto. 
     
     
       14. The solid electrolytic condenser of  claim 1 , wherein a plurality of condenser elements are arranged to be parallel to one another on the terminal reinforcements on which the liquid epoxy resin is coated. 
     
     
       15. The solid electrolytic condenser of  claim 14 , wherein the condenser elements are arranged in parallel in a vertical direction or a horizontal direction. 
     
     
       16. The solid electrolytic condenser of  claim 1 , wherein
 the size of the fillers in the liquid epoxy resin is 20 μm to 30 μm, and 
 the size of the fillers in the molding part is 50 μm to 100 μm.